LTC2644CMS-L8#PBF

Overview

The LTC2644CMS-L8#PBF is a dual-channel, 8-bit PWM-to-voltage output DAC from Analog Devices. It features an integrated 10ppm/°C reference providing a 2.5V full-scale output and operates on a single 2.7V to 5.5V supply. The device converts PWM input signals into stable analog voltages with typical settling times of 7µs. It supports rail-to-rail outputs capable of sourcing/sinking up to 5mA at 3V or 10mA at 5V. Key specifications include ±0.5 LSB maximum DNL, pin-selectable internal or external references, and operation across commercial (0°C to 70°C) temperature ranges in a 12-lead MSOP package.

Feature Summary

• Dual 8-bit resolution with ±0.5 LSB max DNL and guaranteed monotonicity
• No-latency PWM-to-voltage conversion updating within 7µs typically
• Integrated 10ppm/°C reference yielding 2.5V full-scale output
• Pin-selectable idle states and power-down mode (<1µA current)

Applications

• Digital calibration systems
• Trimming and adjustment circuits
• Process control and industrial automation
• Instrumentation level setting

Procurement Notes

Verify the suffix #PBF indicates lead-free packaging compliant with RoHS standards. Confirm the 'C' grade designation matches the required commercial operating temperature range of 0°C to 70°C for the specific application environment.

Selection Notes

Select this part when 8-bit resolution is sufficient for the application to maximize bandwidth, as it supports PWM frequencies up to 100kHz. Ensure the load requirements do not exceed the 5mA sourcing/sinking capability at 3V supplies. Consider the L10 or L12 variants if higher linearity or resolution is required.

Part Context

This component belongs to the LTC2644 family, which offers 12-, 10-, and 8-bit resolutions. The CMS variant specifically denotes the 12-lead MSOP plastic package and commercial temperature grade. It serves as a direct replacement for discrete RC filter and buffer amplifier solutions in PWM-based control loops.

Replacement Considerations

Direct functional substitutes within the same package and specification profile include the LTC2644CMS-L10#PBF and LTC2644CMS-L12#PBF. These offer identical pinouts and interfaces but provide 10-bit and 12-bit resolutions respectively.